Submission #1306754

#	Time	Username	Problem	Language	Result	Execution time	Memory
1306754		muhammad-mutahir	Alternating Heights (CCO22_day1problem1)	C++20	6 / 25	1095 ms	4556 KiB

Main

#include <bits/stdc++.h>
using namespace std;

#define print(l) for(auto i:l) cout<<i<<" ";cout<<endl;
#define input(t,l,n) vector<t>l(n);for(int i = 0;i<n;i++)cin>>l[i];
#define int long long
#define pb push_back
#define ordered_set tree<int, null_type,less<int>, rb_tree_tag,tree_order_statistics_node_update> 
#define all(l) l.begin(),l.end()
#define pii pair<int,int>
#define fi first
#define se second

const int M = 1e9+7;
const int inf = 1e18;


int bp(int x, int y, int p){
    int res = 1;
    x = x % p;
    while (y > 0) {
 
        if (y & 1)
            res = (res * x) % p;
        y = y >> 1;
        x = (x * x) % p;
    }
    return res;
}
 
int MI(int n, int p){
    return bp(n, p - 2, p);
}
int mul(int x,int y, int p){
    return x * 1ull * y % p;
}
int di(int x,int y, int p){
    return mul(x, MI(y, p), p);
}


int n , m , k , q;
vector<vector<int>>adj;
map<int,int>ind;
bool ck0(){
	vector<int>vis(k+1,0);
	map<int,int>ind1 = ind;
	queue<int>Q;
	// vis[scr] = 1;
	int tot = 0;
	int vi = 0;
	for(auto i:ind1){
		if(i.se == 0){
			vis[i.fi] = 1;
			Q.push(i.fi);
		}
		tot++;
	}

	while(Q.size()){
		int u = Q.front();
		Q.pop();
		vi++;		
		for(int v :adj[u]){
			ind1[v]--;
			if(!ind1[v]){
				vis[v] = 1;
				Q.push(v);
			}
		}
	}
	return tot!=vi;
}
void solve(int testcase_number){
     cin>>n>>k>>q;
     input(int,a,n);
     vector<int>maxl(n+1,0);
     for(int i = 0;i<n;i++){
     	int ans = 1;
     	adj.clear();
     	adj.resize(n+1);
     	ind.clear();
     	// cout<<i<<" First"<<endl;
     	for(int j = i;j+1<n;j++){

     		if(j%2 == i%2){
     			// cout<<a[j]<<" "<<a[j+1]<<endl;
     			adj[a[j]].pb(a[j+1]);
     			ind[a[j+1]]++;	
     			ind[a[j]] = ind[a[j]];
     		}
     		else{
     			// cout<<a[j+1]<<" "<<a[j]<<endl;
     			adj[a[j+1]].pb(a[j]);
     			ind[a[j+1]] = ind[a[j+1]];
     			ind[a[j]]++;
     		}
     		// cout<<ck0()<<endl;
     		if(ck0()){
     			break;
     		}
     		ans++;
     	}
     	int ans1 = ans;
//      	
     	ans = 1;
     	adj.clear();
     	adj.resize(n+1);
     	ind.clear();
     	
     	for(int j = i;j+1<n;j++){

     		if(j%2 != i%2){

     			adj[a[j]].pb(a[j+1]);
     			ind[a[j+1]]++;
     			ind[a[j]] = ind[a[j]];
     		}
     		else{

     			adj[a[j+1]].pb(a[j]);
     			ind[a[j+1]] = ind[a[j+1]];
     			ind[a[j]]++;
     		}
     		if(ck0()){
     			break;
     		}
     		ans++;
     	}
     	// cout<<ans<<" "<<ans1<<endl;
     	maxl[i] = max(ans,ans1);
     }
     // print(maxl);
     for(int i = 0;i<q;i++){
     	int l,r;
     	cin>>l>>r;
     	l--;
     	if(l+maxl[l] >= r){
     		cout<<"YES"<<endl;
     	}
     	else{
     		cout<<"NO"<<endl;
     	}
     }
     




}


signed main(){
    ios::sync_with_stdio(0);//DO NOT USE IN INTERACTIVE
    cin.tie(0), cout.tie(0);
    cout << fixed<<setprecision(9);

    int t = 1;
    // cin>>t;
    for(int i = 1;i<=t;i++){
        solve(i);
    }

}

• Subtask 1: 0 / 4
• Subtask 2: 6 / 6
• Subtask 3: 0 / 7
• Subtask 4: 0 / 8